Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) pr...Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) profiles. During late Pleistocene, fluvial and delta plains developed over an unevenly eroded bedrock during low sea level stand, followed by the formation of littoral and lagoon facies and defined coastal barrier-lagoon-estuary system during the post-glacial uppermost Pleistocene-lower Holocene eustatic rise of the sea level, and the upper Holocene high stand. GPR results show that Yudaitan, a sandy coastal bar backed by a low-laying land (shoal) just east of the active lagoon, is a continuous, parallel and slightly-wavy reflectors indicating homogeneous sandy or sandy gravel sediments, and inclined reflectors partly caused by progradation and accumulation of beach sand and gravel. Quasi-continuous, hummocky and chaotic reflectors from the shoal of Nangang village correspond to mixed accumulation of sands and clay. This research indicates the GPR is a non-intrusive, rapid, and economical method for high-resolution profiling of subsurface sediments in sandy gravelly coast.展开更多
The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of China.The coastal geomorphic development basics of the geology and Quaternary environment change are discus...The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of China.The coastal geomorphic development basics of the geology and Quaternary environment change are discussed. Aerial photograph interpretation with fieldwork is applied to draw the outlines of geomorphic types. Based on the investigative data, the exogenic forces and marine organism conditions concerning tropical coast development in the area are expounded, and coastal dynamo-deposition geomorphic bodies are analysed, mainly with sea cliff-abrasion platform,barrier-lagoon system, modern beach, coral reef and mangrove tidal flat, and the general process of coastal evolution at this area, as well as coastline changes since middle Holocene transgression.展开更多
文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时...文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时段。指出七星岗古海岸地形的发现具有重要科学意义,表明中国学者的科研能力媲美同时代的洋学者,这一发现支撑了珠江三角洲的存在,同时为中国古籍对珠江河口湾演变的记述提供了实物证据,数十年来它在高等专业教学实习、科学研究、大众科学知识普及、社会文化教育中发挥了重要的作用,让多代地质、地理、海洋人才从中受益,并对珠江河口三角洲的整治与开发作出了很大的贡献。广州市政府1956年将七星岗古海岸遗址列为广州市重点文物,1983年广东省地理学会决定在该处建立纪念碑,近年建造七星岗古海岸遗址科学公园,这是对七星岗古海岸地形遗迹实施有效保护与发挥科教作用的绝佳举措。吴尚时重视野外考察,实事求是,不迷信、不盲从、善思考、勇探索、勤写作、贡献真知灼见的科学创新精神,值得我们学习。展开更多
基金Project of cooperation between China and Canada, CIDA Project, No. CCHEP 282/19736
文摘Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) profiles. During late Pleistocene, fluvial and delta plains developed over an unevenly eroded bedrock during low sea level stand, followed by the formation of littoral and lagoon facies and defined coastal barrier-lagoon-estuary system during the post-glacial uppermost Pleistocene-lower Holocene eustatic rise of the sea level, and the upper Holocene high stand. GPR results show that Yudaitan, a sandy coastal bar backed by a low-laying land (shoal) just east of the active lagoon, is a continuous, parallel and slightly-wavy reflectors indicating homogeneous sandy or sandy gravel sediments, and inclined reflectors partly caused by progradation and accumulation of beach sand and gravel. Quasi-continuous, hummocky and chaotic reflectors from the shoal of Nangang village correspond to mixed accumulation of sands and clay. This research indicates the GPR is a non-intrusive, rapid, and economical method for high-resolution profiling of subsurface sediments in sandy gravelly coast.
基金国家重点基金课题:“环渤海滨海地球关键带地质结构和岩相古地理研究(42293261)”中国地质调查局项目:“津冀沿海资源环境承载力调查(DD20189506)”+2 种基金中国地质调查局项目:“黄渤海海岸带重点生态保护修复区综合地质调查(DD20211301)”自然科学基金项目:“渤海湾全新世海面标志点研究与变化历史重建(41372173)”“渤海湾西北岸4 ka BP前后古环境重建(41806109)”。
文摘The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of China.The coastal geomorphic development basics of the geology and Quaternary environment change are discussed. Aerial photograph interpretation with fieldwork is applied to draw the outlines of geomorphic types. Based on the investigative data, the exogenic forces and marine organism conditions concerning tropical coast development in the area are expounded, and coastal dynamo-deposition geomorphic bodies are analysed, mainly with sea cliff-abrasion platform,barrier-lagoon system, modern beach, coral reef and mangrove tidal flat, and the general process of coastal evolution at this area, as well as coastline changes since middle Holocene transgression.
文摘文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时段。指出七星岗古海岸地形的发现具有重要科学意义,表明中国学者的科研能力媲美同时代的洋学者,这一发现支撑了珠江三角洲的存在,同时为中国古籍对珠江河口湾演变的记述提供了实物证据,数十年来它在高等专业教学实习、科学研究、大众科学知识普及、社会文化教育中发挥了重要的作用,让多代地质、地理、海洋人才从中受益,并对珠江河口三角洲的整治与开发作出了很大的贡献。广州市政府1956年将七星岗古海岸遗址列为广州市重点文物,1983年广东省地理学会决定在该处建立纪念碑,近年建造七星岗古海岸遗址科学公园,这是对七星岗古海岸地形遗迹实施有效保护与发挥科教作用的绝佳举措。吴尚时重视野外考察,实事求是,不迷信、不盲从、善思考、勇探索、勤写作、贡献真知灼见的科学创新精神,值得我们学习。
